User blog comment:Gelsadra/New theory or nobody ever think of it?/@comment-86.179.45.118-20131113232816/@comment-7738747-20131113235432

If I do believe in it ?No, I don't, but with lack of evidences it doesn't hurt to especulate.

Anyway; Capcom already confirmed  in a official artbook called Devil May Cry 3,1,4,2 artbook that Nero is, in fact, Vergil's child. This same book is being translated by Udon to be release by 2014.

The wh*re theory is, until now, the most probable.